This comes after a terrorist attack at a Metro station in Brussels, Belgium early Tuesday morning.

“The TTC and its staff remain vigilant at all times,” said Brad Ross, TTC executive director of corporate communications, in a statement through Twitter. “We take our lead from law enforcement agencies, but ask our customers that, if they see or hear anything suspicious, to report it to a TTC employee or police: see something, say something.”

The heightened security is a concern for everyday passengers.

“It’s something that’ll sit in the back of my mind when I take the train for sure,” said Jermaine Williams, a daily TTC commuter.

“But for us to live our lives in fear would be to let them win and my values just can’t let me do that,” he added.